Which Statement Summarizes the Current Research Findings Regarding Intellectual Maintenance

Multiple Choice

Which statement summarizes the current research findings regarding intellectual maintenance and decline in early adulthood?

A) Intellectual abilities show a gradual but steady decline beginning in early adulthood and peaking in middle adulthood.
B) Intellectual abilities show essentially no decline in early adulthood, except at the very top levels of intellectual demand.
C) Intellectual abilities increase during the second half of early adulthood, then decline during the first half of middle adulthood.
D) Fluid intelligence increases from early to middle adulthood, but crystallized intelligence decreases during that same period.